I just finished painting the interior of my -8 and felt about 95% was really easy, the last 5% was a huge pain. Don't know if the pain was due to bad technique, or specific issues with the paint I chose.
I cleaned everything with MEK, then primed with Duplicolor self etching paint. That went really well--you've already primed so this won't be helpful for you, but maybe for somebody else. The cans have new nozzles that I thought were real easy to use and get an even and smooth coat. I then painted with Krylon Indoor/Outdoor glossy paint (Ivy Leaf color).
I started on the removable panels and had good results. My plane isn't going to win awards, but I was very happy with the results. I then moved on to the tub--I must not have put it on as thin as Jim because I thought 4 cans should do it but I didn't have enough to finish the right side. What I did paint looks good. The can says you can reapply within 1 hour or after 24, so I waited 48 hours to paint the other side and finish the front floor. That's where the trouble started.
Don't know why, but where ever new paint touched old paint, it ate through. I knew to wet sand the existing paint to dull it up but it didn't matter--it was like putting MEK on paint. The area most affected was the right gear tower, and the front floor. So I then had to mask off the areas with good paint so I could strip down those areas and start over.
Even after masking off the good paint areas, there was a little bleed through with the MEK and new coat of paint, so on some of the fringe areas I still have signs of problems, but at this point I'm done stripping paint and figure these areas are not very visible and/or will be covered by something else.
Not sure what you or anyone else can take from this. Overall I like the way the Krylon went on--only thing I would have done differently is ensured I had way more paint than I thought I needed so I could do everything in one shot. As with most things, trying to fix one problem created 2 more. Thank goodness I don't get out to the shop until after the kids are in bed, because even with a respirator on, my expletives could probably be heard around the neighborhood. In the end, it's almost done (I'm painting the seat backs, and all the powder coated bars black) and I'm happy with it but I know it would go a lot better if I were doing another one right now.
A couple of pictures. First one is the overall look--it's not as yellow in person as it looks in the picture. Second picture is what i was going for--it's pretty close to this color in better light. Third picture is at the front of the spar on the floor--one area where new paint bubbled old paint and will not be seen so I didn't want to strip it for a second time.
Good luck.
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With better lighting, the color looks very close to this (what I was going for)
New paint eats existing paint
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